* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "PingFang SC", "Microsoft Yahei", "Helvetica Neue", Helvetica, "Segoe UI", Arial, sans-serif;
}

a {
  text-decoration: none;
  color: inherit;
}

li {
  list-style: none;
}

body {
  background-color: skyblue;
}